Jack Welch said Thursday that if asked, he wouldn't serve as Donald Trump's Treasury secretary.
"That's the last thing I'm going to be," the longtime Republican and former GE chief told CNBC's "Squawk Box," in reaction to Trump recently floating Welch's name as a possibility.
If the presumptive GOP nominee were to win the White House and offer Treasury, Welch said he would turn down a Cabinet position for the third time in his life. Welch said he was offered jobs by Presidents Ronald Reagan and George W. Bush.
Welch said he'll vote for Trump if he gets the Republican nomination.
"I don't know exactly what I get with the Republican candidate," he said. "[But] I know I got a better shot at jobs, less regulation [with Trump]. He talks about more security. He talks about stronger military. He put out a list of 11 Supreme Court candidates."
Welch had supported Texas Sen. Ted Cruz. "I still remain a jobs, a high-growth, security, Supreme Court voter. That's how I came out on Ted Cruz. I thought he was the best. I liked him. He wasn't able to pull it off."
"[But] without question, you can't have eight more years of this," Welch added, referring to the Democratic policies of President Barack Obama, which he argued would continue under Hillary Clinton if she were to win the White House.
Bernie Sanders thinks the last eight years were not "progressive enough," Welch added.
Welch also was critical of the "Never Trump" movement, which has been led by Weekly Standard Editor Bill Kristol, who reportedly is floating conservative lawyer and National Review columnist David French as the secret third-party candidate.
Kristol had originally been courting better known Republicans, including 2012 GOP nominee Mitt Romney, who's been vocal in denouncing Trump.